From: Sandeep Sheriker Mallikarjun sandeep.sheriker@microchip.com
In PIC32MZ[DA] SoC JTAG and Card_Detect signal are muxed. These created one h/w bug; SDHCI will not detect micro-SD card if JTAG is not connected. To fix this errata, - set Card_Detect_Signal_Selection bit in SDHC HostControl register and - clear CardDetectTestLevel bit in SDHC HostControl register.
Signed-off-by: Sandeep Sheriker Mallikarjun sandeepsheriker.mallikarjun@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com ---
drivers/mmc/sdhci.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 02d71b9..f32fe67 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -424,6 +424,18 @@ static void sdhci_set_ios(struct mmc *mmc) if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT) ctrl &= ~SDHCI_CTRL_HISPD;
+#if defined(CONFIG_PIC32_SDHCI) + /* + * In PIC32MZ[DA] due to h/w bug SDHCI fails detecting card when JTAG + * is not connected. + * To work-around this problem: + * - set Card_Detect_Signal_Selection bit in SDHCI_Host_Control register + * - clear Card_Detect_Test_Level bit in SDHCI_Host_Control register + */ + ctrl |= SDHCI_CTRL_CD_TEST; + ctrl &= ~SDHCI_CTRL_CD_TEST_INS; +#endif + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); }